Peel cucumbers and cut them in half, scraping out seeds. Sprinkle the cucumbers with salt and let them stand 30 minutes. Drain excess water.Chop the cucumbers coarsely and put the pieces in the blender along with scallions, dill, mint, lemon juice, buttermilk, and yogurt. Blend at high speed. Season with salt and pepper to taste. Chill well before serving.

Next time I might use all yogurt so it's a little thicker. I also wouldn't mind a pinch of cayenne in there. I might add that after it has chilled and the flavors have a chance to blend well.